make clobber_all remove the dist so we can catch depedency problems. if you don't

blow away the dist, you can hide module dependencies and build order that need
to be correct in makefile.win DIRS

client.mak

@@ -91,6 +91,7 @@ pull_seamonkey:
 
 clobber_all:
 	@cd $(MOZ_SRC)\$(MOZ_TOP)\.
+	rd /s /q dist
 	nmake -f makefile.win clobber_all 
 
 depend: